There were no immediate reports of possible casualties and the extent of damage the assaults may have inflicted.

The development came only hours after Saudi warplanes carried out four aerial attacks on Dam of Ma’rib as well as al-Hilan and adjacent regions in Yemen’s central province of Ma’rib. No reports of fatalities were immediately available.

The humanitarian situation in Yemen has become critical, with many international aid organizations seeking a safe passage into the country to deliver much-needed medical and humanitarian supplies to the country.

More than four months of Saudi airstrikes have caused severe shortages in basic necessities, and nine million people remain in dire need of immediate assistance across Yemen.

On March 26, Saudi Arabia began its military aggression against Yemen – without a UN mandate – in a bid to undermine the Houthi Ansarullah movement and to restore power to fugitive former President Abd Rabbuh Mansour Hadi, an ally of Riyadh.

Tarik Jasarevic, a spokesman for the World Health Organization, said on Tuesday, that 1,859 civilians were among the total of 3,984 people killed in Yemen until July 19. Local Yemeni sources, however, put the fatality figure at much higher.